echinoderm
No. They are invertebrates related to starfish and sea urchins.
Sand dolar is a simple animal. It is an invertebrate.
Sand dollars a rigid skeleton called a 'test' (which is basically a shell).
Sand dollars has a rigid skeleton known as a "test", but these are not backbones so they are invertebrates. Vertebrates are animals that have spinal chords, heads and backbones. Sand dollars are animals related to sea urchins, in a different group called Echinoids. These have none of spinal chords, heads or backbones, so cannot be vertebrates.
Sand fish eat small invertebrates, especially millipedes.
In the sand
You can not cheat to get sand dollars. You have to work for it, or you have to buy it.
Sand dollars are exothermic, meaning they do not generate their own body heat and instead rely on external sources to regulate their body temperature. As echinoderms, they are ectothermic creatures, typically found in marine environments where their body temperature is influenced by the surrounding water temperature. This characteristic is common among many marine invertebrates.
Sand dollars.
Sand dollars breathe through a process known as diffusion, using their tube feet.
sand dollars got there name because they are shaped like a coin and they dig themselves into the sand